[readme] fnm -> nvm.fish

Author: kidonng

README.md

@@ -207,7 +207,7 @@ If you're running a system without prepackaged binary available, which means you
   - [bass](https://github.com/edc/bass) allows you to use utilities written for Bash in fish shell
   - [fast-nvm-fish](https://github.com/brigand/fast-nvm-fish) only works with version numbers (not aliases) but doesn't significantly slow your shell startup
   - [plugin-nvm](https://github.com/derekstavis/plugin-nvm) plugin for [Oh My Fish](https://github.com/oh-my-fish/oh-my-fish), which makes nvm and its completions available in fish shell
-  - [fnm](https://github.com/fisherman/fnm) - [fisherman](https://github.com/fisherman/fisherman)-based version manager for fish
+  - [nvm.fish](https://github.com/jorgebucaran/nvm.fish) - The Node.js version manager you'll adore, crafted just for Fish
   - [fish-nvm](https://github.com/FabioAntunes/fish-nvm) - Wrapper around nvm for fish, delays sourcing nvm until it's actually used.
 
 **Note:** We still have some problems with FreeBSD, because there is no official pre-built binary for FreeBSD, and building from source may need [patches](https://www.freshports.org/www/node/files/patch-deps_v8_src_base_platform_platform-posix.cc); see the issue ticket: